Rotary drill



,May 22, 1928. v 1,670,808

c. c. HANSEN ROTARY DRILL Filed June 25, 1926 3 Sheejs-Sheet 1 IIIIIIHH I I l INVENTOR.

HIS AT'I NEY.

C. C. HANSEN ROTARY DRILL May 22, 1-928. 1 1,670,808

Filed June-25; 1926 3 sheets sheet 2 11 a Ill l V I III V a Q I \I\\ O I, n Q o o 8 r 5 u O \J I I y I NV EN TOR.

O O g filanden f BY Q z ZL/ L 111d ATT' NVEY.

May 22, 1928. 1,670,808 c. c. HANSEN ROTARY DRI LL Filed June 25. 1926 s Sheets-Sheet 3 YINVENTOR.

, ale/s1 andm BY H15 ATT NEY.

Patented May 22, 1928.

UNITED STATES PATENT OFFICE 1 CHARLES c. HANSEN, or EASTON, PENNSYLVANIA, assrenoa 'ro rnennfsonnmnn COMPANY, 01 JERSEY CITY, NEwa RsEY, A CORPORATION or NEW ,J'EBSEY,

, ROTARY DRILL.

Applicationfiled June 25, 1926. Serial No. 118,490.

This invention relates to rotary drills, but more particularly to a feeding mechanism of drills of this type for feeding the drill bit to the Work andfor removing it therefrom.

The objects of the invention are to insure a uniform feeding presure to the vdrill bit and to provide adequate adjusting means for the feeding mechanism.

Other objects ,of the invention will be in art obvious and in part pointed out hereinafter; a

The invention is shown in one of its preferred forms in the drawings, in which Figure 1 is a front elevation of a drill constructed vin accordance with the practice of the invention,

Figure 2 is a sectional elevation taken through Figure 1 on the line 22 looking in the direction of the arrows, and

Figure 3 is a top planview of the drill.

Referring-to the drawings, thevinvention is shown embodied in a drill designated generally by A and having a frame B which may be secured to a supporting structure U in any suitable manner. The frame B is provided with side plates D in which is journaled a shaft E carrying at one end or near one end a sprocket F which may mesh with a suitable driving chain (not shown) leading from a prime mover (not shown). Secured to the shaft E is an intermediate gear G which meshes with a drum gear H keyed or otherwise secured to a drum shaft J journaled inthe' side plates D. A drum K freely rotatable on the shaft J is provided with a cone L at one end to engage a conical recess 0 formed in one side of the drum gear H in a well known manner.

Any suitable and well known means may be provided for actuating the cone L of the drum K into engagement with the drum gear H, as for instance, linkage P leading from the shaft J to'an' actuating lever Q, located in a convenient position at the base of the supporting structure C. The actuating meansfor forcing. the cone Linto engagement with the drum gear H is preferably of such type that when the lever Q is moved in one direction or the other, the drum will be caused to move longitudinally of the shaft J in a well known manner, either to move In the present instance, the gate S is pro-' vided at its upper and lower ends with arms V and W respectively having bores X into which are fitted bushings Y to form bearlngs fora driving spindle Z. 'A wearing sleeve I) islinserted in the upper bushing Y to rotate therein and is interlocked slidably with the spindle Z by means of a. key 0. The lower bushing Y is preferably of suificlent diameter to receive rotatably a hollow extension d of a beveled pinion 0 through which the spindle Z extends. The sleeve b is also provided with'a key 0 which cooperates slidably with a key slot f formed in the spindle Z to prevent relative rotation between the pinion e and the spindle.

The ends ofthe spindle Z are preferably of smaller diameter than the spindle to form shoulders 9 against which are seated collars'h. The collars k may be screwed to the spindle as illustrated and serve as seats for anti-friction bearings j of cross headsla arranged on opposite sides of the gate S.

In order that the cross heads 70 maybe I held against rotation about the axis of the spindle Z, the rods 0 are arranged slidably through the gate S on opposite sides of the sp1nd'leto extend with their ends through the cross heads and are provided with nuts 39 whereby the cross heads is and the bear ings j are held securely against longitudinal movement with respect to the spindle, The lowermost end of the spindle Z in this instance is screw threaded asatq to receive a correspondingly screw threaded" chuck fr having chuck jaws afor securing a hollow' ranged on o posite sides of the spindle Z and are suita ly secured at their lower ends to the lower cross head is by means of bolts or pins 0 and at their upper ends are providedwith threaded bolts w which extend through the upper cross head is. Nuts 0: are screwed on bolts to for supporting the upper ends of the chains and for regulating the tension of the chains u.

Secured to a shaft y'journaled in'the gate S are a pair of sprockets 2 which mesh with the chains to. The shaft y, and consequently the sprockets z, are preferably off-set from the longitudinal axis of the spindle Z and thus also with respect to the ends of the chains. In order that the chains to may engage a plurality of teeth of the sprockets z, idler sprockets 2 are arranged aboveand below the sprockets z and between the axes of the shaft 3/ and the spindle Z, said idler s rockets 2 being freely rotatable about suita le shafts 3 journaled in the gate S at their outer ends, and at their inner ends in the arms V. y 7

Suitable means are provided for manually rotating the sprockets z to actuate the spindle Z in the direction of its longitudinal axis, either for feeding the core bit 1) into the work or for retracting it therefrom. To this end a worm gear 4 is mounted freely rotatable on the shaft 3 and meshes with a worm 5 supported by a bearing 6. The worm 5 is preferably provided with an integral shaft 7, the outer end 8 of which is of hexagonal form to receive a ratchet 9 whereby the worm 5 may be rotated. In the resent instance, the ratchet 9 carries a han 1e 10 and is preferably of the reversible type, so that when the handle 10 lies in one position, as for instance, in the position il-' lustrated in the drawing, a downward pull of the handle 10 will rotate the worm 5 in the direction for feeding the spindle Z downwardly; The handle 10 and the ratchet 9 may be turned through an arc of 180 to occupy a position on the other side of the worm 5 corresponding to the. position illustrated. If desired, a counter-weight 11 may be secured to the handle 10 near its outer end so that in the operation of the device the operator will merely have to raise the handle 10 and thereafter may release said handle since the weight of the counterweight 11 will "be sufficient to rotate the sprockets z for actuating the spindle Z in an endwise direction.

To the end that the manually operable feeding mechanism of the drill may be uickly released in case it bedesired to raise t .e spindle Z by means other than the ratchet 9, a clutch collar 12 carried by the shaft y and normally engaging a clutch jaw 13 of the worm ear 4 may be moved out of engagement wit said clutch jaw and the shaft 3/ will thenbefreeto rotate in the worm gear 4. During the normal operation of the drill the clutch collar 12 will be held in engagement with the clutch jaw 13 by means of a spring 14 seated at one end against the clutch collar and at its other end against a collar 15 at the end of'the shaft 3 In the present instance, the rotary movement of the shaft E is transmitted through a counter-shaft 16 for rotating the spindle Z. The shaft 16'is rotatable in the frame B and carries a pinion 17 meshing with an intermediate gear 18 keyed to the shaft E;

To the opposite end of the shaft 16 is secured a beveled gear 19 to mesh with a beveled pinion 20 having a hollow extension 21 rotatable in a bearing 22 supported by the frame '13. The pinion 20 in this instance is held against longitudinal movement with respect to the bearing 22 by the gear 19 and is bored to receive slidably a shaft 23 carrying at its front end a beveled gear 24 which meshes with the beveled pinion e in the gate S. The pinion 20 may besecured to the shaft 23 against relative rotative movement in any suitable manner, but such means preferably permit of relative longitudinal movement between the shaft 23 and the pinion 20. In order to accomplish this purpose in the present instance, a key 25 is secured to the inion 20 to engage a long kev slot 26 in t e shaft 23.

To the end that the beveled gear 24 may be quickly removed or drawn out of mesh with the pinion e the forward end of the shaft 23 is provided with a slidable bearing 27 supported in a c lindrical housin 28 of the frame B. The caring 27 is pre erabl held against relative rotative movement with respect to the housing '28 by keys 29. The forward portion, or end, of the bearing .27 is preferably reduced somewhat to form an annular shoulder 30 which ma abut an inwardly extending flange 31 o the cylindrical housing 28 for limitin the forward movement of the bearing 2 In this way the gear 24 will be prevented from meshing too tightly with the pinion e. The shaft 23 and the bearing 27 are preferably held against relative longitudina movement by a collar 32 formed on theshaft 23 to abut the rearward end of the bearing 27: A screw 33- screwed in the front end of the shaft 23 serves to clamp the gear 24 and the bearing 27 securely on the shaft.

Convenient means is provided for actuating1 the shaft 23 together with the partssecure thereto in the direction of their longitudinal axes. To this end an anti-friction caring 34 is secured to the rearward end of the shaft 23 and is seated in a hollow sleeve 35 to rovide for-free relative rotative movement etween the shaft 23 and the sleeve 35 during the normal operation of the drill. The rearward end of the sleeve 35 in thisinstance is screw threaded to cooperate I to the provision of means for adjusting the tension of 881d. chains, a uniform, efficient with the feed screw 36 anchored in the frame B and having a suitable crank 37 at its rearward end whereby the screw 36 may be mani ulated. v

y means of the resent invention, I have greatly simplified t e construction of drills of this character and have increased the drilling efliciency of such drills considerably. This is due chiefl to the simplified construction and meth of manipulation of the feeding mechanism.- Owin to the manner of anchoring the ends of the chains u and and readily controlled fe'edin pressure may be at all times obtained. tages of the present invention over other well known devices of this character are that the drive shaft 23 together with the driving gear 24, may be removed entirely out of line of the drill hole and, due to the slidable bearing 27, the shaft 23 is at all times well supported near its outer end. This feature tends to at the same time permits the removal of all parts which might act as an obstruction during the operation of inserting casings into the drill hole, thus eliminating the necessity of removing the entire drilling mechanism further advan lengthen the life of the drill and.

from the vicinity of the drill hole to permit the insertion of such casings.

I claim:

1. In a rotary drill, the combinationwith a frame, a gate pivoted thereon, and a drill spindle rotatable in the ate, of a drive shaft, a gear on the drive sha to rotate the spindle, a bearing for the drive shaft slidable in the frame and keyed thereto, and means associated with the drive shaft for actuating the drive shaft and the bearing in the direction of their longitudinal axes to withdraw the drive shaft gear within the frame.

2. In a rotary drill, the combination with a frame, a gate pivoted on the frame, and a drill, spindlerotatable in the gate, of a drive shaft sup orted by the frame, a ear on the drive sha 1 for rotating the spindle, a bearing for one end of the shaft slidable in the frame, a sleeve rotatable on the other end of the shaft, and a screw in the frame to cooperate with the sleeve for actuating the drive shaft and the bearing in the direction of their longitudinal axes to withdraw the gear within the frame.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN. 

